Brushless Jammin CRT Project
 

I have finally started a new project.
Brushless Jammin CRT Truggy
So far I have purchased

Jammin crt pro kit
NRI Tomahawk suspension (I need a little bling)
Xtreme RC Racing rear uprights
Spektrum Radio

on my list to purchase:
Dace 23MM adapters
Dace skid plate
king headz Upper Steering Plate
Proline 23mm Wheels
Crowdpleazer 2 show body with $ paint job

I need input on a Brushless setup I want this truck to be a beast :028:
I will be using lipos but this will be my first lipo setup also so I need help with that too.:032: Hyperion Polyquest "Lite Storm" are these good? I want the best:027:
I have been thinking of a lehner 2250 8 turn I dont want to run more than 22.2 volts lipo though so I dont know if that motor will work for me I may need a lower turn? I dont know I need your help here.
Maybe lehner 1950 would be better?

I have access to machine shop at work and custom composite fabrication(ME)
I have never made a motor mount before but it doesnt seem too hard. I want to use a 51t mod 1 Spur like Mike sells (if it will yield appropriate gearing?) I am not sure how to adapt it though; if anyone has done this on a similar center diff help and advice would be awesome.

As I get things in and assembled I will post pictures
Thanks

You dont need to go near the 22 series. A 1950/9 or 10 turns will do the job just fine. Get the micro 20120 controller for your setup or the 36120.

i wouldnt go for a 36120. if im not mistaken they have a 42000 rpm motor limit. the 3695 will do i think. also, i would go for the 2250 if funds permit. with the 51 tooth spur you will probably need a rather big pinion. so gearing shouldnt be a problem. mike can make you one if he can find the proper gear stock for it.

IMO it won't be near heavy enough for a 2250,a 1950 on 6s will be extreme already( go for a 1600 to 1800kv for 6s).Either a 36120 or a 3695 would be good ( no need to go over 42000 rpm) or the MGM 16024.

What's the diff ratio?

@squee,it won't need a very big pinion, to hit about 65 mph with 3.3:1 diffs and 40000 rpm is around 16/51(somewhere in that ballpark)

EDIT;nl12,get in touch with Mike for a spur adapter,he'll likely make you an adapter for the 51T spur.

The diff ratio is 43/13
Gustav I will ask mike about an adapter for the spur gear, thanks

Edit: 1950 7 turn 1791kv I may go with this if others seem to agree, I am still pondering the 22 series....... something about it

the 1950 is a good motor for that setup but if you want insane speed and the most biggest super-d-duper motor around, go with the 2250. if i had the funds to get one i would but....

have you got experience with BL? if so, how many cells?

A 1950 would do, really.
On 6S, take a wind that would give you around 40mph on 6S, and you will have an awesome setup.

A 1950 on 6s could do upwards of 50mph+ IMO. But if you really want your truck to be an absolute beast, then a 2250 would be the option - personally a 1950 would be plenty for me. You will also need a hell of a controller for the 2250/8, nothing less than an MGM 16024 or bk 20150/36150.

there are a few steps in between though.. How about a 2230? it will have got a bit more torque than the 1950.. or the 2240. which is quite a beast as well.

what is your experience with BL? and with how many cells?

A jammin crt with a 2250 would totally be a beast. You may want to consider a 2250 7t I think would be better than the 8 t for 22volts. The 1950 would push it around on lipo pretty easy. 1950 8t would be a beast as well.

Project sounds awsome, Keep us updated.

Thanks,
Joe

the 2250/7 is 1691kv.. i realy prefer a /10 instead.. gives you more room for a more gentle gearing. remember that the jammin has got limited gearing options Leroy.

I am taking that into account rene. The 10 doesn't start to come alive on 22volts. That is why I said a 7. It has enough torque to pull it. It is no more limiited than my truck really. You see what I am talking about when you test it. 18cells is like a good start for it on a 10 turn.

why such a huge motor? The 2250 is $400? How big is a jammmin CRT?

jammins have about a 17" wheelbase. i think...

nop its 14.5 :)

Hey that is about your length stampy.

so why a 2250 when you can buy a 9xl or something like that for $340 less??

cool: ya pretty close about mines about .25 longer
super: the 2250 is more powerfull and smoother than the xl motors

Well super it is like why get a 1950 when you get a xl either. It comes down to the quality. The 1950 is smoother and more powerful than the xl motors. The 2250 is just a plan power house. Yes it is some money to pay for a motor. I have one and it is worth the money. I love it.

i meant over all length, not wheelbase:013:

so why not a 2280 high amp?

Because it's not a go-cart that needs to be powered....

i think they end up only around 4kg RTR.The question is how fast do you want to go?i think 50mph is fast for an off-road truck but some people need more.
Also is lightweight and handling more important or big power and straightline speed.
For a racier 40mph setup i'd take a 1940,mount it above the spur in the centre and move the batteries closer to the centre line to lower the yaw moment.i think that would be the best handling.
For heavier motors,i'd mount it low beside the spur,due to the weight of the motor.
A 1950 would do mid 50s i would think,beyond that the 2240.

I'd be a little cautious about the alloy bevel shafts in the Jammin,i guess any BL motor will test these though.
Edit;nl12,since you have access to a machine shop it would be easy to run off a set of steel bevel gear shafts on a lathe if the alloy ones become a problem.

The 2280 would be nice if you planning to ride it to. The 2250 is more power than a rc can handle. The motor turns whether truck moves or not. I have ripped the teeth off a couple spurs now. I put better tires on and the problem has got worse. I am trying to put a stronger mount in truck and go from there.

Man, I was satisfied with my 7xl. I guess its gonna become outdated to like the old basic 4200's, hacker 8or12s, and the c50's. Until the lehner's come down in price, I'm sticking with my xl's.........


Needless to say that would be insane to put a 2250 on that Jammin, put some wings on the sides and take off.....

If you want to step up in power some nitro. The 1950 has some more power than the xl cans.

With triple the price too......... I'm in college, working to pay for gas expenses commuting back and forth. Nothing big is going to be bought until the summer unless it blows up.....

If you happy with it why worry. :D Me I am hard to satisfy me. I love power.

Coolhand, what 2250 turn do you have? What vehicle do you run it in? And how many volts?

I'm probably just gonna buy a wanderer, but if I get the dough I'll buy the 2250.

And if there is too much power with the 2250, why not use like a 30t pinion gear (from kershaw)?

a 2250/10. there is quite some difference between the XL and the 2250.. :p

I have a 2250 10t. I have a center diff to lower the final drive ratio to 10.5 to 1. I have ran a few cell counts on it. It is awesome. It is way more powerful than a 7xl. The torque is unexplainible. I love it.

Do you have any pics of your prodject ?.

whos project?

:032: Who's project hippie? I can send you some if you like.

I did'nt know there was more than one prodject. Anybody's prodject pics would be great. THANK"S

lol!

I mailed you some hippie of mine. You may have seen them. If not here is a couple to
www.rcpics.net/members/coolhandcountry

Thank's leroy i got them, i was wanting to see pics of the BL crt truggy.